/*
Copyright 2006 Jerry Huxtable

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package com.jhlabs.image;

import java.awt.*;
import java.awt.geom.*;
import java.awt.image.*;

// TODO: Auto-generated Javadoc
/**
 * The Class MirrorFilter.
 */
public class MirrorFilter extends AbstractBufferedImageOp {
    
    /** The opacity. */
    private float opacity = 1.0f;
	
	/** The centre y. */
	private float centreY = 0.5f;
    
    /** The distance. */
    private float distance;
    
    /** The angle. */
    private float angle;
    
    /** The rotation. */
    private float rotation;
    
    /** The gap. */
    private float gap;

    /**
	 * Instantiates a new mirror filter.
	 */
    public MirrorFilter() {
	}
	
	/**
     * Specifies the angle of the mirror.
     * @param angle the angle of the mirror.
     * @angle
     * @see #getAngle
     */
	public void setAngle( float angle ) {
		this.angle = angle;
	}

	/**
     * Returns the angle of the mirror.
     * @return the angle of the mirror.
     * @see #setAngle
     */
	public float getAngle() {
		return angle;
	}
	
	/**
	 * Sets the distance.
	 * 
	 * @param distance
	 *            the new distance
	 */
	public void setDistance( float distance ) {
		this.distance = distance;
	}

	/**
	 * Gets the distance.
	 * 
	 * @return the distance
	 */
	public float getDistance() {
		return distance;
	}
	
	/**
	 * Sets the rotation.
	 * 
	 * @param rotation
	 *            the new rotation
	 */
	public void setRotation( float rotation ) {
		this.rotation = rotation;
	}

	/**
	 * Gets the rotation.
	 * 
	 * @return the rotation
	 */
	public float getRotation() {
		return rotation;
	}
	
	/**
	 * Sets the gap.
	 * 
	 * @param gap
	 *            the new gap
	 */
	public void setGap( float gap ) {
		this.gap = gap;
	}

	/**
	 * Gets the gap.
	 * 
	 * @return the gap
	 */
	public float getGap() {
		return gap;
	}
	
	/**
     * Set the opacity of the reflection.
     * @param opacity the opacity.
     * @see #getOpacity
     */
	public void setOpacity( float opacity ) {
		this.opacity = opacity;
	}

	/**
     * Get the opacity of the reflection.
     * @return the opacity.
     * @see #setOpacity
     */
	public float getOpacity() {
		return opacity;
	}
	
	/**
	 * Sets the centre y.
	 * 
	 * @param centreY
	 *            the new centre y
	 */
	public void setCentreY( float centreY ) {
		this.centreY = centreY;
	}

	/**
	 * Gets the centre y.
	 * 
	 * @return the centre y
	 */
	public float getCentreY() {
		return centreY;
	}
	
    /* (non-Javadoc)
     * @see java.awt.image.BufferedImageOp#filter(java.awt.image.BufferedImage, java.awt.image.BufferedImage)
     */
    public BufferedImage filter( BufferedImage src, BufferedImage dst ) {
        if ( dst == null )
            dst = createCompatibleDestImage( src, null );
        BufferedImage tsrc = src;
		Shape clip;
		int width = src.getWidth();
		int height = src.getHeight();
		int h = (int)(centreY * height);
		int d = (int)(gap * height);

		Graphics2D g = dst.createGraphics();
		clip = g.getClip();
		g.clipRect( 0, 0, width, h );
		g.drawRenderedImage( src, null );
		g.setClip( clip );
		g.clipRect( 0, h+d, width, height-h-d );
		g.translate( 0, 2*h+d );
		g.scale( 1, -1 );
		g.drawRenderedImage( src, null );
		g.setPaint( new GradientPaint( 0, 0, new Color( 1.0f, 0.0f, 0.0f, 0.0f ), 0, h, new Color( 0.0f, 1.0f, 0.0f, opacity ) ) );
		g.setComposite( AlphaComposite.getInstance( AlphaComposite.DST_IN ) );
		g.fillRect( 0, 0, width, h );
		g.setClip( clip );
		g.dispose();
        
        return dst;
    }
    
	/* (non-Javadoc)
	 * @see java.lang.Object#toString()
	 */
	public String toString() {
		return "Effects/Mirror...";
	}
}
